Hi SilverDinosaurBunny,
You can write a comment for another member on in the comment box on any page.
Please try to post a comment which is relevant to the page you are writing on. For example you could ask who wants to be friends on this page:http://learnenglishkids.britishcouncil.org/en/your-turn/best-friends
I hope you have fun practising your English on LearnEnglish Kids!